Annual report pursuant to Section 13 and 15(d)

U.S. Pension Plan Investment Allocations by Asset Category (Detail)

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U.S. Pension Plan Investment Allocations by Asset Category (Detail) (USD $)
In Thousands, unless otherwise specified
Aug. 31, 2013
Aug. 31, 2012
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of pension plan assets $ 34,054 $ 33,695
Percentage of fair value of pension plan assets 100.00% 100.00%
Cash and cash equivalents | Level 1 Valuation
   
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of pension plan assets 348 250
Percentage of fair value of pension plan assets 1.00% 0.70%
Fixed Income Securities | Level 2 Valuation
   
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of pension plan assets 12,205 10,477
Percentage of fair value of pension plan assets 35.90% 31.10%
Fixed Income Securities | Government Bonds | Level 2 Valuation
   
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of pension plan assets 0 310
Percentage of fair value of pension plan assets 0.00% 0.90%
Fixed Income Securities | Corporate Bond | Level 2 Valuation
   
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of pension plan assets 8,741 7,489
Percentage of fair value of pension plan assets 25.70% 22.20%
Fixed Income Securities | Mutual Funds | Level 2 Valuation
   
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of pension plan assets 3,464 2,678
Percentage of fair value of pension plan assets 10.20% 8.00%
Equity Securities | Mutual Funds | Level 1 Valuation
   
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of pension plan assets $ 21,501 $ 22,968
Percentage of fair value of pension plan assets 63.10% 68.20%